The boy was walking with his twin brother when the incident happened and was only days away from his birthday.

Several "persons of interest" were in custody in the shooting, said Chicago Police Spokesman Thomas Sweeney, but as of 11:15 a.m. Sunday, they had been released.

In the latest shooting, a 40-year-old man was in serious condition after being shot around 1:10 a.m. Sunday in the Logan Square neighborhood on the Northwest Side, said Chicago Police News Affairs Officer Amina Greer.

The man was outside in the 3000 block of North Milwaukee Avenue when he heard gunshots, Greer said.

He was shot in his arm and back and was taken to Advocate Illinois Masonic Medical Center where he was listed in serious condition, Greer said.

No one is in custody as a result of the shooting.

Around 12:45 a.m., a 35-year-old man was critically injured and a 23-year-old man was shot in the Palmer Square neighborhood on the Northwest Side, Greer said.

The two came out of a vehicle into an alley in the 2300 block of North Sacramento Avenue when an offender walked up to them, fired shots and ran away, Greer said.

Both men drove themselves to Norwegian American Hospital.

The 35-year-old suffered multiple gunshots to the body and was later transferred to John H. Stroger Jr. Hospital of Cook County where he was listed in critical condition, Greer said.

The 23-year-old was hit in the arm and suffered a graze wound to his eye. He was at Norwegian American Hospital where his condition stabilized, Greer said.

No one is in custody as a result of the shooting.

Five minutes earlier, around 12:40 a.m., a person was shot while driving on the Eisenhower Expressway near the South Austin neighborhood on the West Side.

The person, whose age and gender was not immediately available, was driving on the westbound Interstate 290 east of Laramie Avenue when the shooting happened, said Illinois State Police Sgt. Michael Dolis.

The person received minor injuries and was dropped off at Loretto Hospital where his condition stabilized, Dolis said.

No other details about the shooting were immediately available.

Around 11:15 p.m. Saturday, two 21-year-old men and a 19-year-old man were shot in the Lawndale neighborhood, Greer said.

Police officers were in the 3300 block of West Polk Street when they heard gunshots and discovered three men shot in a vehicle in the 1500 block of South Karlov Avenue, Greer said.

The three men told the police they were driving east on Polk Street when another car, which was going westbound, passed them. Someone inside the car fired shots, and the three men managed to drive away, Greer said.

The second 21-year-old man was hit in the foot and was transported to Mount Sinai Hospital where he also stabilized.

The 19-year-old was shot in the leg and was taken to Saint Anthony Hospital where he stabilized, Greer said.

No one is in custody as a result of the shooting, Greer said.

At about 8:17 p.m. a 32-year-old man was shot on the 100 block of South Kilbourn Avenue when a vehicle pulled up and someone from inside began firing, police said. The man was shot in the foot and was taken in good condition to Mount Sinai Hospital, police said.

On the 1200 block of South Albany Avenue a 29-year-old man was shot at 8:07 p.m., Sweeney said. The victim sustained a gunshot wound to his torso and hand and was taken in serious condition to Stroger Hospital, police said.

At about 3 p.m. a 24-year-old man was shot in both legs on the 900 block of North Karlov Avenue, Sweeney said. The man had an argument with someone who left and returned with a gun and opened fire, said Sweeney. The man was in good condition at Mount Sinai Hospital, police said.

At 2:23 p.m., a 34-year-old woman was driving in her vehicle on the 400 block of South Kostner Avenue when someone drove up to her car and began firing, Sweeney said. The woman suffered a graze wound to her leg.

A short time later at 1:45 p.m., a 29-year-old man was working on his car on the 7900 block of South Manistee Avenue when a male tried to rob him, Sweeney said. The victim attempted to run away when he was shot in the left leg, Sweeney said. The man was taken in good condition to Northwestern Memorial Hospital, Sweeney said.

Around 1:10 p.m., an 18-year-old man was shot on the 2900 block of West Jackson Boulevard, said Chicago Police Spokesman Thomas Sweeney.

The man was shot in the leg and was taken to Mount Sinai Hospital in good condition, Sweeney said. The man, a documented gang member, was standing when someone came up to him and fired, police said.

ABout 6:35 a.m. Saturday, a 35-year-old man was shot in the left ankle and was in good condition at Jackson Park Hospital. The man told police he heard shots and felt pain while he was in the 400 block of East 87th Street.